View of the demolished 20th (Twentieth) Street Viaduct in the Union Pacific Railway yards near downtown Denver, Colorado. A pick-up and the abandoned Hungarian Flour Mill (Mill House) building are in the distance.

View of the end of the demolished 20th (Twentieth) Street Viaduct in downtown Denver, Colorado. The abandoned Hungarian Flour Mill (Mill House) building is in the distance. A sign reads: "The Centennial School Supply Co."

An Amtrak train makes its way past the partially demolished 20th (Twentieth) Street Viaduct in Denver, Colorado. Graders and a front-end loader are nearby. The abandoned Hungarian Flour Mill (Mill House) building and houses are in the distance.

View of the partially demolished 20th (Twentieth) Street Viaduct in Denver, Colorado. The abandoned Hungarian Flour Mill (Mill House) building and a building with a sign that reads: "G E" are in the distance.

View of a crane near the partially demolished 20th (Twentieth) Street Viaduct in Denver, Colorado. A sign reads: "2100 20th St." The abandoned Hungarian Flour Mill (Mill House) building is in the distance.

View of the partially demolished 20th (Twentieth) Street Viaduct in Denver, Colorado. The bridge spans the South Plate River. The abandoned Hungarian Flour Mill (Mill House) building is in the distance.